Rheem · Updated June 2026
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42): price & specs
The Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) costs $689, #12 cheapest of 18 water softeners (median $630). It earns a Silver Deskmark — 83/100 pay-blind standing, #8 of 19 in class.
Verified Jun 27, 2026 · figures linked to their source in the table below
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42). Every price and spec below is linked to its source and dated — no guesses.
Source: rheemwatertreatment.com verified ✓ corroborated verify in ledger
Is the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) a good buy?
At $689, the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) is #12 cheapest of the 18 water softeners we track, where the median is $630. On the spec sheet, its flow rate gpm of 9.9 is the lowest of the 7, its tank warranty years of 10 is the highest of the 12, and its grain capacity of 42.4 is above the median of the 18.
Specifications
| Price (US) | $689 $689 regular price at Home Depot. $639 with Home Depot credit card promo. Original harvested price of $639 was the promo price. |
|---|---|
| Brand | Rheem |
| Released | — |
| Grain capacity | 42.4 |
| System type | ion-exchange |
| Flow rate gpm | 9.9 |
| Salt efficiency lbs per kgrains | — |
| Iron removal ppm | 11 |
| Nsf certifications | — |
| Smart app control | Yes |
| Tank warranty years | 10 |
| Msrp usd | 689 |
Source: rheemwatertreatment.com (verified 2026-06-26) · corroborated by homedepot.com. Rheem manufacturer page confirms 42,400 grain rated capacity at 16.3 lbs salt dose, 9.9 GPM service flow, 11 ppm iron removal, WiFi via iQua app, warranty 1yr parts/3yr electronics/10yr tanks. Home Depot search results confirm $689 regular price ($639 with credit card promo). Salt efficiency listed as 5,010 grains per 2.5 lbs salt. Price corrected from harvested $639 to $689 regular retail.
Is the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) worth it vs cheaper water softeners?
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) against its closest cheaper and pricier water softeners on the specs that matter — every value sourced. See all 18 ranked →
| Product | Price | Grain capacity | System type | Flow rate gpm | Iron removal ppm | Smart app control |
|---|---|---|---|---|---|---|
| Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) this | $689 | 42.4 | ion-exchange | 9.9 | 11 | Yes |
| A.O. Smith 45,000 Grain Smart Water Softener (AO-WH-SOFT-450T) | $649 | 45 | ion-exchange | — | 10 | Yes |
| Whirlpool WHES30E 30,000 Grain Water Softener | $698.94 | 30 | ion-exchange | — | 8 | No |
Frequently asked questions
How much does the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) cost?
The Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) has a US price of $689 ($689 regular price at Home Depot. $639 with Home Depot credit card promo. Original harvested price of $639 was the promo price.), as of 2026-06-26.
How does the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) compare on price?
At $689, the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) is #12 cheapest of the 18 water softeners we track, where the median is $630.
What are the Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42)'s key specs?
Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) (Rheem): grainCapacity 42.4, systemType ion-exchange, flowRateGpm 9.9, ironRemovalPpm 11, smartAppControl Yes. Full sourced spec sheet verified 2026-06-26.
Similar water softeners
Nearest in price — swipe to browse. Every pick sourced and dated.
-
Whirlpool WHES30E 30,000 Grain Water Softener -
A.O. Smith 45,000 Grain Smart Water Softener (AO-WH-SOFT-450T) -
Whirlpool WHES40E 40,000 Grain Water Softener -
Aquasure Harmony Series 48,000 Grain Digital Metered Water Softener (AS-HS48D) -
Morton M45C 45,000 Grain Wi-Fi Water Softener -
WaterBoss 900 36,400 Grain Water Softener -
Fleck 5600SXT 48,000 Grain Metered Water Softener -
GE 40,000 Grain Water Softener (GXSH40V) -
Rheem Preferred Plus 42,000 Grain Water Softener (RHS42) -
A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T) -
WaterBoss 700 22,000 Grain Water Softener -
Morton M34 Elite 34,000 Grain Water Softener
All water softeners ranked → · Open data & methodology · Queryable via MCP
Compare with
Head-to-head
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs Whirlpool WHES40E 40,000 Grain Water Softener
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs GE 40,000 Grain Water Softener (GXSH40V)
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs WaterBoss 700 22,000 Grain Water Softener
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs Morton M34 Elite 34,000 Grain Water Softener
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs EcoPure EP42 42,000 Grain Water Softener
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs A.O. Smith 40,000 Grain Water Softener (AO-WH-SOFT-400T)
- Rheem Preferred Platinum 42,000 Grain Smart Water Softener (RHW42) vs NuvoH2O Manor Salt-Free Water Softener System (DPMB)
Cheaper water softeners
- A.O. Smith 45,000 Grain Smart Water Softener (AO-WH-SOFT-450T) $649
- Whirlpool WHES40E 40,000 Grain Water Softener $629.99
- Aquasure Harmony Series 48,000 Grain Digital Metered Water Softener (AS-HS48D) $629.99
- Morton M45C 45,000 Grain Wi-Fi Water Softener $622.99
- WaterBoss 900 36,400 Grain Water Softener $580
- GE 40,000 Grain Water Softener (GXSH40V) $569
Step up
- Whirlpool WHES30E 30,000 Grain Water Softener $698.94
- Fleck 5600SXT 48,000 Grain Metered Water Softener $799
- NuvoH2O Manor Salt-Free Water Softener System (DPMB) $999.99
- SpringWell SS1 Salt-Based Water Softener (32,000 Grain) $1620
- Aquasana SimplySoft 40,000 Grain Water Softener (WH-SF40) $1698
- DROP Smart Water Softener (S-32, 32,000 Grain) $3441